Belt for papermaking and process for producing papermaking belt
CA 2643178 C · Owner: Yamauchi Corporation · Inventors: Hikida, Takahisa; Watanabe, Atsushi; Watanabe, Atsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A papermaking belt comprising a reinforcing substrate embedded in a thermosetting polyurethane layer, said thermosetting polyurethane layer including an inner polyurethane layer and an outer polyurethane layer adhering to the outer peripheral surface of said inner polyurethane layer and each of said inner polyurethane layer and said outer polyurethane layer is made of a composition comprising a urethane prepolymer having isocyanate end groups and a hardener having active hydrogen end groups. The composition forming said inner polyurethane layer is prepared by mixing the urethane prepolymer and the hardener with each other in a ratio setting the equivalent ratio (H/NCO) between the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 7, 2001 and granted January 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 7, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.